I remember that. He was going to shake the moderator's hand after shaking Obama's and he was going around the table in one direction, while the moderator was going in the other, so he made the funny face as he was deciding which way to go around the table. I've done that. The picture makes him seem to be interacting with Obama, when he was actually interacting with the moderator.

Shows how still pictures can freeze a moment in time and distort reality.